//
//  AliyunUploadImage.m
//  Exam-iOS
//
//  Created by lishengfeng on 2018/3/11.
//  Copyright © 2018年 李胜锋. All rights reserved.
//

#import "AliyunUploadImage.h"
#import <AliyunOSSiOS/AliyunOSSiOS.h>

#define aliyunEndpoint @"http://oss-cn-beijing.aliyuncs.com"

@implementation AliyunUploadImage
+ (void)uploadImage:(UIImage *)image
    withImageUpload:(NSDictionary *)imgupload
        resultBlock:(void (^)(NSString *url))result {
    

    NSData *imgdata = UIImageJPEGRepresentation([AliyunUploadImage fixOrientation:image], 1);
    
    NSDateFormatter *formatter = [[NSDateFormatter alloc] init];
    
    formatter.dateFormat = @"yyyyMMddHHmmss";
    
    NSString *nowTimeStr = [formatter stringFromDate:[NSDate dateWithTimeIntervalSinceNow:0]];
    
    int randomNum = arc4random() % 89999 + 10000;
    
    NSString *name = [[nowTimeStr stringByAppendingString:[NSString stringWithFormat:@"%d",randomNum]] stringByAppendingString:@"_cpm.jpg"];
    //    NSString *name = [MGLSafeObject stringInfo:imgupload[@"urlPri"]];
    
    id<OSSCredentialProvider> credential = [[OSSFederationCredentialProvider alloc] initWithFederationTokenGetter:^OSSFederationToken * {

        OSSFederationToken * token = [OSSFederationToken new];
        token.tAccessKey = imgupload[@"accessKeyId"];
        token.tSecretKey = imgupload[@"accessKeySecret"];
        token.tToken = imgupload[@"securityToken"];
        token.expirationTimeInGMTFormat = imgupload[@"expiration"];
        return token;
    }];
    
    
    NSString *bucket = imgupload[@"bucket"];
    // http://oss-cn-beijing.aliyuncs.com
    OSSClient *client = [[OSSClient alloc] initWithEndpoint:aliyunEndpoint credentialProvider:credential];
    
    OSSPutObjectRequest * put = [OSSPutObjectRequest new];
    
    put.bucketName = bucket;
    
    put.objectKey = name;
    
    put.uploadingData = imgdata;
    
    NSString *urlStr = imgupload[@"urlPri"];
    OSSTask *putTask = [client putObject:put];
    [putTask continueWithBlock:^id(OSSTask *task) {
        if (!task.error) {
            NSString *url = [NSString stringWithFormat:@"%@/%@", urlStr, name];
            if (result) {
                result(url);
            }
            
        } else {
            if (result) {
                result(nil);
            }
        }
        return nil;
    }];
    
}


+ (UIImage *)fixOrientation:(UIImage *)aImage {
    
    // No-op if the orientation is already correct
    if (aImage.imageOrientation == UIImageOrientationUp)
        return aImage;
    
    // We need to calculate the proper transformation to make the image upright.
    // We do it in 2 steps: Rotate if Left/Right/Down, and then flip if Mirrored.
    CGAffineTransform transform = CGAffineTransformIdentity;
    
    switch (aImage.imageOrientation) {
        case UIImageOrientationDown:
        case UIImageOrientationDownMirrored:
            transform = CGAffineTransformTranslate(transform, aImage.size.width, aImage.size.height);
            transform = CGAffineTransformRotate(transform, M_PI);
            break;
            
        case UIImageOrientationLeft:
        case UIImageOrientationLeftMirrored:
            transform = CGAffineTransformTranslate(transform, aImage.size.width, 0);
            transform = CGAffineTransformRotate(transform, M_PI_2);
            break;
            
        case UIImageOrientationRight:
        case UIImageOrientationRightMirrored:
            transform = CGAffineTransformTranslate(transform, 0, aImage.size.height);
            transform = CGAffineTransformRotate(transform, -M_PI_2);
            break;
        default:
            break;
    }
    
    switch (aImage.imageOrientation) {
        case UIImageOrientationUpMirrored:
        case UIImageOrientationDownMirrored:
            transform = CGAffineTransformTranslate(transform, aImage.size.width, 0);
            transform = CGAffineTransformScale(transform, -1, 1);
            break;
            
        case UIImageOrientationLeftMirrored:
        case UIImageOrientationRightMirrored:
            transform = CGAffineTransformTranslate(transform, aImage.size.height, 0);
            transform = CGAffineTransformScale(transform, -1, 1);
            break;
        default:
            break;
    }
    
    // Now we draw the underlying CGImage into a new context, applying the transform
    // calculated above.
    CGContextRef ctx = CGBitmapContextCreate(NULL, aImage.size.width, aImage.size.height,
                                             CGImageGetBitsPerComponent(aImage.CGImage), 0,
                                             CGImageGetColorSpace(aImage.CGImage),
                                             CGImageGetBitmapInfo(aImage.CGImage));
    CGContextConcatCTM(ctx, transform);
    switch (aImage.imageOrientation) {
        case UIImageOrientationLeft:
        case UIImageOrientationLeftMirrored:
        case UIImageOrientationRight:
        case UIImageOrientationRightMirrored:
            // Grr...
            CGContextDrawImage(ctx, CGRectMake(0,0,aImage.size.height,aImage.size.width), aImage.CGImage);
            break;
            
        default:
            CGContextDrawImage(ctx, CGRectMake(0,0,aImage.size.width,aImage.size.height), aImage.CGImage);
            break;
    }
    
    // And now we just create a new UIImage from the drawing context
    CGImageRef cgimg = CGBitmapContextCreateImage(ctx);
    UIImage *img = [UIImage imageWithCGImage:cgimg];
    CGContextRelease(ctx);
    CGImageRelease(cgimg);
    return img;
}

@end
